US 12,247,882 B2
Method and system comprising entrance optics, interferometer, and transformation layer for detection of electromagnetic radiation
Philippe Arthur Jean Ghislain Chevalier, Deinze (BE)
Assigned to Lyseonics BV, Deinze (BE)
Appl. No. 17/286,059
Filed by Lyseonics BV, Deinze (BE)
PCT Filed Oct. 29, 2018, PCT No. PCT/EP2018/079582
§ 371(c)(1), (2) Date Apr. 16, 2021,
PCT Pub. No. WO2020/088737, PCT Pub. Date May 7, 2020.
Prior Publication US 2021/0341337 A1, Nov. 4, 2021
Int. Cl. G01J 5/00 (2022.01); G01J 5/02 (2022.01); G01J 5/08 (2022.01); G01N 21/17 (2006.01); G01N 21/47 (2006.01); G01J 5/58 (2022.01)
CPC G01J 5/0003 (2013.01) [G01J 5/0265 (2013.01); G01J 5/0859 (2013.01); G01N 21/171 (2013.01); G01N 21/47 (2013.01); G01N 21/4795 (2013.01); G01J 2005/0077 (2013.01); G01J 2005/0092 (2013.01); G01J 2005/583 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An electromagnetic imager for imaging electromagnetic radiation from an object comprising:
an unbalanced single-wavelength phase-shift laser diode interferometer including a measurement arm and a laser diode for emitting electromagnetic radiation;
entrance optics comprising a thermally controlled electromagnetic radiation input window and an output window transparent to an output wavelength of the electromagnetic radiation of the laser diode for allowing the electromagnetic radiation to enter the electromagnetic imager, comprising an image plane onto which an image of the object is to be imaged between the thermally controlled electromagnetic radiation input window and the output window, separated by a small distance from each other in a range of 1 micron to 100 micron;
wherein the output wavelength of the electromagnetic radiation of the laser diode is modulated by a direct modulation of an injection current of the laser diode,
wherein the thermally controlled electromagnetic radiation input window and the output window containing the image plane between the thermally controlled electromagnetic radiation input window and the output window is in the measurement arm; and
a transformation layer, contained between the thermally controlled electromagnetic radiation input window and the output window, at the image plane, for transforming the electromagnetic radiation from the object into a spatiotemporal variation of a refractive index of the transformation layer for causing spatiotemporal optical phase differences in the measurement arm of the unbalanced single-wavelength phase-shift laser diode interferometer representative of the image of the object, and
wherein the transformation layer is a thin layer having a thickness of microns of a solid, a liquid, a gas, or any combination thereof.